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Python 3.7.0a1

Release Date: Sept. 19, 2017

This is an early developer preview of Python 3.7

Major new features of the 3.7 series, compared to 3.6

Python 3.7 is still in development. This releasee, 3.7.0a1 is the first of four planned alpha releases. Alpha releases are intended to make it easier to test the current state of new features and bug fixes and to test the release process. During the alpha phase, features may be added up until the start of the beta phase (2018-01-29) and, if necessary, may be modified or deleted up until the release candidate (2018-05-21) . Please keep in mind that this is a preview release and its use is not recommended for production environments.

Many new features for Python 3.7 are still being planned and written. Among the new major new features and changes so far:

  • PEP 538, Coercing the legacy C locale to a UTF-8 based locale

The next pre-release of Python 3.7 will be 3.7.0a2, currently scheduled for 2017-10-16.

More resources

Notes on this release

  • Windows users: The binaries for AMD64 will also work on processors that implement the Intel 64 architecture. (Also known as the "x64" architecture, and formerly known as both "EM64T" and "x86-64".)
  • Windows users: If installing Python 3.7 as a non-privileged user, you may need to escalate to administrator privileges to install an update to your C runtime libraries.
  • Windows users: There are now "web-based" installers for Windows platforms; the installer will download the needed software components at installation time.
  • Windows Users: There are redistributable zip files containing the Windows builds, making it easy to redistribute Python as part of another software package. Please see the documentation regarding Embedded Distribution for more information.
  • macOS users: If you are using the Python 3.7 from the binary installer linked on this page, please carefully read the Important Information displayed during installation; this information is also available after installation by clicking on /Applications/Python 3.7/ReadMe.rtf. There is important information there about changes in the 3.7 installer-supplied Python, particularly with regard to SSL certificate validation.
  • macOS users: There is important information about IDLE, Tkinter, and Tcl/Tk on macOS here.

Full Changelog


Version Operating System Description MD5 Sum File Size GPG
Gzipped source tarball Source release f16dda6e0f78e17b2afa87bf5504bfa7 20.6 MB SIG
XZ compressed source tarball Source release ab4a7f93f9a788868f8f429a461f966e 15.5 MB SIG
Mac OS X 64-bit/32-bit installer macOS for Mac OS X 10.6 and later 62d849319bf424a4a3cd46c48c9892f9 26.5 MB SIG
Windows help file Windows 154adcbeddecec152e44abb2b6882a92 7.7 MB SIG
Windows x86 embeddable zip file Windows ea82fc2e2f5138290a3e8e4e7e764bad 5.9 MB SIG
Windows x86 executable installer Windows 9bedbbfec870fcafa060a2d08a6d5bf4 29.8 MB SIG
Windows x86 web-based installer Windows 32dcafc7c4a507047ba2f684aff130a9 1.2 MB SIG
Windows x86-64 embeddable zip file Windows for AMD64/EM64T/x64, not Itanium processors 09e47034bfc6f1ebba495eaf9a0fc504 6.4 MB SIG
Windows x86-64 executable installer Windows for AMD64/EM64T/x64, not Itanium processors 3a37fa9539393b5d84e45c3062e1b6a6 30.5 MB SIG
Windows x86-64 web-based installer Windows for AMD64/EM64T/x64, not Itanium processors 6f8c5f77a75e69f2afc1a75478435bf3 1.3 MB SIG